I'm RBN, and I took one of those "Do I have NPD" quizzes, and I'm worried/I think something is missing

As a parentified daughter of a narc, and one who basically was the emotional and sometimes practical mother to my younger sister, something seems to be missing in these quizzes, which is that I feel, and have felt, utterly drained by my wholly unhealthy bio family, so I cannot muster energy for friendships. It's just self-protective. And I suppose I can't muster huge amounts of empathy for other people after spending 40 years of my life empathizing so deeply with my bio family that it subsumed me. It's not that I think I'm better than anyone or only want to use people etc., it's just that being raised RBN is so traumatizing that I can appear cold or withholding when really I'm simply exhausted. Does anyone relate to this?